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So..she was almost burned alive but was saved by someone. Unfortunately all her servants were killed. She wasn't found and was assumed death due to the burnt traces and dead bodies of her servants. This is the manhwa version.
Well, I've also read some spoilers (novel) that she really died on the story and the emperor died while still grieving her death.
There are 2 endings
She didn't.
They got together and have two beautiful/handsome children. The first child, look exactly like Hyeonbi (FL). And the emperor he voluntarily step out on his throne and give it to his brother because he decided to live normal with his beloved Hyeonbi.
Around chapter 100-110 he grieve because of Hyeonbi's death (which is not, she's alive and someone save her)

its still sad that Fl dies but ML deserves it